Sending RPC to a specific client

I have a gameobject called "GlobalChat" that has a networkView attached and a Chat script that has lot of RPC functions, anyway a specific RPC function is targted to a client (the receiver of the chat entry) but when this RPC function is invoked i keep getting this two errors :

View ID SceneID: 0 Level Prefix: 0 not found during lookup. Strange behaviour may occur

and

Could't invoke RPC function 'functionName' because the networkView 'SceneID: 0 Level Prefix: 0' doesn't exist

so how can i solve this problem, i only want to call the rpc function to the specific client and this error is preventing from doing this ?!

here is a sample of the rpc function that is never called due to this error, hint: this part of code is from Chat script that is attached to an empty game object with networkView and has a scene id (not insantiated)

 // This function is called on the client when the client OnMouseDown() another player
     public void UpdateReceiverInfo(int _senderId, NetworkPlayer _receiver)
     {
         // create a receiver data structure and store receiver info
         int key = int.Parse(_receiver.ToString());
 
         if (!receivers.ContainsKey(key))        // if the key doesn't exist in the receiver array, then add the receiver and add a chat entries associated with it
         {
             // Add an entries list to this specified new receiver
             ArrayList entries = new ArrayList();                    // holds the text entries written by the connected players
             entriesArr.Add(key, entries);                           // add this entries list to the entries arr
 
             Receiver r = new Receiver();
             r.receiverId = NetworkUser.clients[key].id;              // retreive the receiver id from the static clients array
             r.receiverName = NetworkUser.clients[key].name;          // retreive the receiver name from the static clients array
             r.receiverPlayer = _receiver;                              // retreive the receiver player from the static clients array
 
             receivers.Add(key, r);                                   // append the receiver data stucture to the receivers list
         }
 
         activeRIndex = key;             // set the active client that we are currently chating with
 
         // update the sender info to the receiver
         networkView.RPC("ReceiveUpdateReceiverInfo", _receiver, _senderId, _receiver);
     }
 
     // This function is sent from a specific client that will receive the chat entry from the sender 
     [RPC]
     void ReceiveUpdateReceiverInfo(int _receiverId, NetworkPlayer _sender)
     {
         print("Entered [RPC] ReceiveUpdateReceiverInfo");        // ERROR: This line is never executed becuz of the error
         // This function is sent to the receiver client, in this case swap the process and convert the sender as receiver
         int key = _receiverId;
 
         if (!receivers.ContainsKey(key))        // if the key doesn't exist in the receiver array, then add the receiver and add a chat entries associated with it
         {
             // Add an entries list to this specified new receiver
             ArrayList entries = new ArrayList();                    // holds the text entries written by the connected players
             entriesArr.Add(key, entries);                           // add this entries list to the entries arr
 
             Receiver r = new Receiver();
             r.receiverId = NetworkUser.clients[key].id;              // retreive the receiver id from the static clients array
             r.receiverName = NetworkUser.clients[key].name;          // retreive the receiver name from the static clients array
             r.receiverPlayer = _sender;                              // retreive the receiver player from the static clients array
 
             receivers.Add(key, r);                                   // append the receiver data stucture to the receivers list  
         }
 
         activeRIndex = key;             // set the active client that we are currently chating with
     }